Improvement in machines for cutting screws



D. MCGUlRE Machines for Cutting Screws N0.140,212 1 Patentedlune 24,1873.

Illllll wig mma UNITED STATES PATENT OFFICE.

DAVID IiLoGUIRE, or NORTHAMPTON, MASSACHUSETTS.

IMPROVEMENT IN MACHINES FOR CUTTING SCREWS.

Specification forming part of Letters Patent No. 140,2!2, dated J une 24,1873 application filed March 26, 1873.

.To all whom it may concern: course, but one socket, a, would be necessary Be it known that I, DAVID MCGUIRE, of for'its reception.- I

Northampton, in the county of Hampshire Through the side of the enlargement Bof and State of Massachusetts, have invented the mandrel is passed a thumb-screw, F, "the certain Improvements in Machines for Outtin .inner end of which is made to' enter a depres- Screw-Thieads on Bolts; of which the followsion, 0, formed on the outer periphery of theiug is a specification, reference being had to collet D, as seen in'Fig; 1. Y l the accompanying drawings, in which-*- The depression 0 may be either a simplede- Figurel represents a horizontal seetionof a pression of suitable sizeand shapeto receive die-stock and its connection with the mandrel, the end of the thumb-screw, or it may be formhaving my improvements applied thereto. ed by cutting an annular 'depressionaround Fig. 2 represents an end view of the inner end the collet, as shown in Fig. 1. v of the die-stock,detached from the mandrel; The die G is secured to the die-stock, by and Fig. 3 a similar viewof the corresponding means of stout 1 screws, (I, in any suitable end of the mandrel. manner.

My improvement relates to a new and im- Thus constructed the die-stock is easily fitproved mode of constructing and connecting ted to and removed from the mandrel, and the collet of the die-stock with the mandrel, when once fitted in and the thumb-screw with a view of facilitating the removal and retightened up, it forms asolid connection with placement of interchangeable dies for cutting the mandrel. These advantages are of great screw-threads on bolts, &c. value where screw-bolts of different sizes have To enable others skilled in the art to make, to be cut through the medium of interchangeeonstruct, and use my invention, I will now able dies, or where dies of difl'erent sizes have proceed to describe its parts in detail, omitto be used in cutting threads on bolts.

tingadescriptionof sucli parts of the machine Having described my invention, what I .as are unnecessary to a complete understaudclaim as new, and desire to secure by Letters ing of the present improvement. I Patent. is-

. In this case the drawings simply represent 1'. A die-stock provided with a collet, l), a portion or section of the mandrel of the mahaving one or more clutch-projections, b, in chine, and of the die-stock and dies, and not combination with a mandrel provided with a of the operative parts of the machine proper, corresponding socket, 0, and one or more as such are not necessary;- the improvement clutch depressions, a, the whole being c0n- ,being capable of being applied tothe mandrel structed and operated in the manner substanof any machine usedin cutting screw-threads tially as and 'for the purposes set forth. on bolts, so far as known. 2. In combination with a die-stock having A represents the mandrel, and B anenlargea collet, D, provided with clutchprojections b. ment at its end to act as a socket, (J, for the and a mandrel having a Socket, 0, andfclutch collet-l) of the. die-stock E. At the inuerend depressions (I, the thumb-screw Ffan'd dc.- of the socketG are found two or more deprespression c, as arranged for the purpose set sions a for the reception of the projections b forth. formed on the end of the collet D. These de- In testimony whereof I have hereunto subpressions a and projections b are made of corscribed this specification. responding size and shape to act as teeth en- DAVID MCGUIRE. tering their sockets, and so as to fit easily but snugly within each other. Instead of using \Vitnesses: two or more of these teeth, b, but on'eof suit- E. (J. CRAFTS, able size may be used, in which case, .of O. H. PIERCE. 

